摘要
叶绿素a作为最重要的水质参数之一,是评价水体富营养化和初级生产力状况的主要因素。我国海洋一号C(HY-1C)卫星海岸带成像仪(CZI)具有高时空分辨率的观测优势。本文基于东海和南海现场实测数据建立了HY-1C卫星CZI叶绿素a浓度反演模型并在实测水域进行反演,与MODIS叶绿素a浓度反演产品进行了对比验证,应用CZI叶绿素a浓度模型在珠江口、长江口、渤海湾水域进行了叶绿素a浓度反演示例试验。结果表明,叶绿素a浓度模型估算浓度与实测浓度相关系数为0.7743,平均相对误差为24.58%,利用实测叶绿素a浓度对模型进行精度验证,相关系数达到0.9939,平均相对误差为18.49%。模型在实测水域反演得到的叶绿素a浓度分布与MODIS叶绿素a浓度产品分布大体一致。在珠江口水域反演得到叶绿素a浓度空间分布为由西北向东南逐级递减,峰值出现在珠江口西沿岸。在长江口、渤海湾反演叶绿素a浓度空间分布均符合地理实情。研究表明HY-1C卫星CZI数据可应用于中国近海水色定量化研究。
As one of the most important water quality parameters,chlorophyll a is an important indicator to evaluate the degree of eutrophication of water bodies and also the main factors of primary productivity state of the oceans.The coastal zone imager(CZI)onboard the Chinese Haiyang-1C(HY-1C)satellite has an advantage observation in high temporal and spatial resolution.In this study,a chlorophyll a concentration retrieval model for CZI onboard the HY-1C satellite is developed from the in-situ measurements in the East China Sea and the South China Sea.The chlorophyll a concentration is retrieved by the model in the measured waters and compared with MODIS chlorophyll a concentration.The chlorophyll a concentration also retrieved in the Zhujiang River Estuary,Changjiang River Estuary and Bohai Bay.The correlation coefficient between the predicted value of the model and the insitu chlorophyll a concentration is 0.7743,the average relative error is 24.58%.The accuracy of the model is verified with the in-situ measurements with the correlation coefficient of 0.9939 and the average relative error of 18.49%.The distribution of chlorophyll a concentration retrieved from CZI is nearly the same as that of MODIS.The chlorophyll a concentration decreases gradually from northwest to southeast and the peak value locates on the west bank of the Zhujiang River Estuary.The inversion of chlorophyll a concentration in Changjiang River Estuary and Bohai Bay accords with the actual situation.The work in this study indicates that HY-1C satellite coastal zone imager data are useful for the monitoring of coastal ocean color in China.
作者
滕越
邹斌
叶小敏
Teng Yue;Zou Bin;Ye Xiaomin(National Marine Environmental Forecasting Center,Beijing 100081,China;National Satellite Ocean Application Service,Beijing 100081,China;Key Laboratory of Space Ocean Remote Sensing and Application,State Oceanic Administration,Beijing 100081,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2022年第5期25-34,共10页
基金
民用航天技术预先研究项目(D040107)。
关键词
HY-1C卫星
海岸带成像仪
叶绿素A浓度
珠江口
HY-1C satellite
coastal zone imager
chlorophyll a concentration
Zhujiang River Estuary
